MD History: Add confirmation dialog when deleting items from the toolbar

chrome/browser/ui/webui/history_ui.h

Index: chrome/browser/ui/webui/history_ui.h
diff --git a/chrome/browser/ui/webui/history_ui.h b/chrome/browser/ui/webui/history_ui.h
index 0b576bc8fb213b644555f254367b1318ed9e83a3..5f4eb1b98b4d6caf36bd0bfb1849e056cf0a15a6 100644
--- a/chrome/browser/ui/webui/history_ui.h
+++ b/chrome/browser/ui/webui/history_ui.h
@@ -9,6 +9,8 @@
 #include "content/public/browser/web_ui_controller.h"
 #include "ui/base/layout.h"
 
+class Profile;
+
 namespace base {
 class RefCountedMemory;
 }
@@ -21,6 +23,10 @@ class HistoryUI : public content::WebUIController {
   static base::RefCountedMemory* GetFaviconResourceBytes(
       ui::ScaleFactor scale_factor);
 
+  // Returns a localized string warning about deleting history. Takes into
+  // account whether or not incognito mode is available.
+  static base::string16 GetDeleteWarningString(Profile* profile);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(HistoryUI);
 };